CN109002236B - Flexible touch screen, manufacturing method thereof and display device - Google Patents
Flexible touch screen, manufacturing method thereof and display device Download PDFInfo
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- CN109002236B CN109002236B CN201810803180.5A CN201810803180A CN109002236B CN 109002236 B CN109002236 B CN 109002236B CN 201810803180 A CN201810803180 A CN 201810803180A CN 109002236 B CN109002236 B CN 109002236B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary substrates
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
- H10K77/111—Flexible substrates
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- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
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- G—PHYSICS
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- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
- H01L27/1266—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/311—Flexible OLED
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a flexible touch screen, a manufacturing method thereof and a display device, wherein the manufacturing method comprises the following steps: attaching a first protective layer on the surface of the flexible substrate; attaching the surface of the flexible base material on the side departing from the first protective layer to the substrate; removing the first protective layer; forming a touch electrode layer on one side of the flexible base material, which is far away from the substrate base plate; attaching a second protective layer on the surface of the touch electrode layer; separating the flexible base material from the base substrate; and removing the second protective layer. According to the manufacturing method of the flexible touch screen, the first protective layer is attached to the surface of the flexible base material before the flexible base material is attached to the substrate, the first protective layer plays a supporting role and enables the flexible base material to be smoothly attached to the substrate, in addition, the second protective layer is attached after the touch electrode layer is manufactured, and therefore when the flexible base material is separated from the substrate, the flexible base material cannot be curled, and the product yield is improved.
Description
Technical Field
The invention relates to the technical field of touch display, in particular to a flexible touch screen, a manufacturing method thereof and a display device.
Background
With the rapid development of display technology, an Organic Light-Emitting Diode (OLED) display gradually becomes a hot spot of current electronic display, and the principle of the OLED display is a self-luminous technology, that is, electron-hole filling is adopted to cause electron level transition to emit Light. The OLED display is first applied to mobile phones, and many high-grade mobile phone products in the market currently adopt OLED displays, such as the model S6/S7/S8 of samsung mobile phones, and the model R9 of OPPO mobile phones. In addition, flexible touch screens developed in response to the development of OLED displays have been gradually popularized in the OLED display field.
In the prior art, due to the influence of factors such as product yield, moire phenomenon, transmittance and the like, a touch electrode made of a metal material has many defects, and a touch electrode made of a transparent conductive oxide has good conductivity and transmittance, for example, Indium Tin Oxide (ITO) can be used to make the touch electrode, and a flexible touch screen made of the transparent conductive material will occupy the market share of an OLED display for a long time. With the rapid development of full-screen mobile phones, the flexible touch screen is required to have a narrow frame or even no frame, so that the driving chip (IC) can have driving capability only when the touch electrode has lower sheet resistance. In addition, in order to reduce the power consumption of the OLED display on the touch screen, the touch electrodes are also required to be developed to have a low resistance.
However, since the touch electrode of the flexible touch screen is required to have a lower sheet resistance, the thickness of the transparent conductive oxide film for manufacturing the touch electrode needs to be increased, the increased thickness of the transparent conductive oxide film can increase the compressive stress of the transparent conductive oxide film, and the flexible substrate is generally thinner, so that the flexible touch screen is easily curled when the flexible touch screen is torn off from the substrate after the flexible touch screen is manufactured, thereby affecting the yield of the flexible touch screen.
Disclosure of Invention
The embodiment of the invention provides a flexible touch screen, a manufacturing method thereof and a display device, which are used for solving the problem that the flexible touch screen is easy to curl in the manufacturing process in the prior art.
In a first aspect, an embodiment of the present invention provides a method for manufacturing a flexible touch screen, including:
attaching a first protective layer on the surface of the flexible substrate;
attaching the surface of one side of the flexible base material, which is far away from the first protective layer, to a substrate;
removing the first protective layer;
forming a touch electrode layer on one side of the flexible base material, which is far away from the substrate base plate;
attaching a second protective layer to the surface of the touch electrode layer;
separating the flexible base material from the base substrate;
and removing the second protective layer.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, a difference between a thermal expansion coefficient of the first protection layer and a thermal expansion coefficient of the flexible substrate is less than 0.05%;
the difference between the thermal expansion coefficient of the second protective layer and the thermal expansion coefficient of the flexible base material is less than 0.05%.
In a possible implementation manner, in the manufacturing method provided in the embodiment of the present invention, the material of the first protective layer is phenolic resin, polyethylene terephthalate, or cyclic olefin polymer;
the second protective layer is made of phenolic resin, polyethylene terephthalate or cyclic olefin polymer.
In a possible implementation manner, in the manufacturing method provided by an embodiment of the present invention, attaching a surface of the flexible base material, the surface being away from the first protective layer, to a substrate includes:
forming a temperature control bonding layer on the substrate base plate;
and the flexible base material is attached to the substrate base plate through the temperature control bonding layer.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, the removing the second protection layer includes:
and cutting the flexible substrate forming the touch electrode layer, and removing the second protective layer.
In a possible implementation manner, in the above manufacturing method provided by an embodiment of the present invention, before attaching a first protective layer to a surface of a flexible substrate, the method further includes:
and respectively forming a hardened layer on two surfaces of the flexible substrate.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, attaching a first protective layer to a surface of a flexible substrate includes:
forming a layer of vanishing layer on the surface of any one side of the flexible base material;
and attaching the first protective layer on the shadow eliminating layer.
In a possible implementation manner, in the manufacturing method provided in an embodiment of the present invention, the forming a touch electrode layer on a side of the flexible base material away from the substrate includes:
forming a plurality of first touch electrodes and a plurality of second touch electrodes on one side of the flexible base material, which is far away from the substrate base plate; the first touch electrode and the second touch electrode are mutually crossed, the first touch electrode is of a strip structure, and the second touch electrode comprises a plurality of sub-electrodes;
forming a plurality of signal lines; the signal line is connected with the first touch electrode or the second touch electrode;
forming an insulating layer on the film layer on which the signal line is positioned;
forming a plurality of bridge lines over the insulating layer; the bridging lines are used for connecting the sub-electrodes in the second touch electrode.
In a second aspect, an embodiment of the present invention provides a flexible touch screen, which is manufactured by the above method for manufacturing a flexible touch screen.
In a third aspect, an embodiment of the present invention provides a display device, including: the flexible touch screen is provided.
The invention has the following beneficial effects:
the embodiment of the invention provides a flexible touch screen, a manufacturing method thereof and a display device, wherein the manufacturing method comprises the following steps: attaching a first protective layer to the surface of the flexible substrate; attaching the surface of the flexible base material, which is far away from one side of the first protective layer, to the substrate base plate; removing the first protective layer; forming a touch electrode layer on one side of the flexible base material, which is far away from the substrate base plate; attaching a second protective layer on the surface of the touch electrode layer; separating the flexible base material from the base substrate; and removing the second protective layer. According to the manufacturing method of the flexible touch screen provided by the embodiment of the invention, the first protective layer is attached to the surface of the flexible base material before the flexible base material is attached to the substrate, the first protective layer plays a supporting role, the flexible base material can be smoothly attached to the substrate, and the first protective layer is removed after the flexible base material is attached to the substrate, so that the structure of the flexible touch screen cannot be influenced.
Drawings
Fig. 1 is a flowchart of a method for manufacturing the flexible touch screen according to an embodiment of the present invention;
fig. 2a to fig. 2g are schematic views of a flow structure corresponding to the above-mentioned manufacturing method according to an embodiment of the present invention;
fig. 3a to fig. 3m are schematic views of another flow structure corresponding to the manufacturing method according to the embodiment of the present invention;
101, a flexible substrate; 102. a first protective layer; 103. a substrate base plate; 104. a touch electrode layer; 105. a second protective layer; 201. a hardened layer; 202. a shadow eliminating layer; 203. a temperature bonding layer; 204. a first transparent conductive layer; 205. a metal layer; 206. an insulating layer; 207. a second transparent conductive layer.
Detailed Description
Aiming at the problem that a flexible touch screen is easy to curl in the manufacturing process in the prior art, the embodiment of the invention provides the flexible touch screen, the manufacturing method thereof and the display device.
The following describes specific embodiments of a flexible touch panel, a manufacturing method thereof, and a display device according to embodiments of the present invention in detail with reference to the accompanying drawings. The thicknesses and shapes of the various film layers in the drawings are not to be considered as true proportions and are merely intended to illustrate the present invention.
In a first aspect, an embodiment of the present invention provides a method for manufacturing a flexible touch screen, as shown in fig. 1, including:
s101, attaching a first protective layer 102 on the surface of the flexible base material 101, as shown in FIG. 2 a;
s102, attaching the surface of the flexible base material 101 on the side away from the first protective layer 102 to the substrate 103, as shown in fig. 2 b;
s103, removing the first protective layer to obtain a structure shown in FIG. 2 c;
s104, forming a touch electrode layer 104 on one side of the flexible base material 101, which is far away from the substrate base plate 103, as shown in FIG. 2 d;
s105, attaching a second passivation layer 105 on the surface of the touch electrode layer 104, as shown in fig. 2 e;
s106, separating the flexible base material 101 from the substrate base plate to obtain a structure shown in figure 2 f;
s107, removing the second protective layer to obtain the structure shown in figure 2 g.
According to the manufacturing method of the flexible touch screen provided by the embodiment of the invention, the first protective layer is attached to the surface of the flexible base material before the flexible base material is attached to the substrate, the first protective layer plays a supporting role, the flexible base material can be smoothly attached to the substrate, and the first protective layer is removed after the flexible base material is attached to the substrate, so that the structure of the flexible touch screen cannot be influenced.
The method for manufacturing the flexible touch screen provided by the embodiment of the invention is mainly used for manufacturing an external hanging type touch screen, that is, after the flexible touch screen is manufactured, the flexible touch screen can be attached to a display panel to realize touch display, for example, the flexible touch screen can be attached to a light emitting surface of an OLED display panel to realize flexible touch display, and in addition, the method can also be applied to other display panels, for example, a liquid crystal display panel, and the application scene of the manufacturing method is not limited here.
In practical applications, it is preferable to use a transparent conductive material to manufacture the touch electrode, for example, an ITO material may be used, and other transparent conductive materials may also be used.
In the prior art, the most common ITO sheet resistance is 100 Ω/□, a Roll-to-Roll (Roll to Roll) coating process can be adopted to manufacture the touch electrode layer, and the ITO sheet resistance which can be manufactured by the existing coating equipment is 70 Ω/□ at the lowest due to the limitations of the coating equipment and the influence of cracks easily generated by rolling after coating. However, with the development of the narrow frame technology and the full-screen technology, the width of the signal line connected to the touch electrode is required to be narrower and narrower, for example, the width of the signal line is required to be less than 20 μm at present, however, the narrower the signal line, the greater the resistance value of the signal line, which requires reducing the sheet resistance of the touch electrode (ITO) to meet the driving requirement of the driving chip (IC), and the sheet resistance of the ITO is required to be 30-40 Ω/□ at present. The sheet resistance is the ratio of resistivity to thickness, therefore, the thickness that needs increase ITO can reach lower sheet resistance, because ITO is thicker, therefore leads to compressive stress great, and flexible base material is thinner moreover, and this very easy emergence is curled when just leading to the flexible base material of having made touch electrode layer to tear from the substrate base plate.
According to the manufacturing method of the flexible touch screen provided by the embodiment of the invention, the first protective layer is attached to the surface of the flexible base material before the flexible base material is attached to the substrate, and the second protective layer is attached after the touch electrode layer is manufactured, so that the flexible base material is not easy to curl when being separated from the substrate, and a thicker touch electrode layer can be manufactured to meet the requirement of low sheet resistance. Although the narrowing of the signal line increases the resistance, the resistance of the touch electrode accounts for about 70% -80% of the total resistance, so that the sheet resistance of the touch electrode layer is reduced, and the RC can be reduced, wherein R represents a channel resistance and C represents a capacitance, thereby shortening the charging time of the display device (such as a mobile phone) and improving the touch sensitivity.
In the embodiment of the present invention, the touch electrode layer is fabricated on the flexible substrate, so that the flexible touch screen can be implemented, wherein the flexible substrate is preferably a Cyclic Olefin Polymer (COP), and other materials may be used as long as they are flexible materials, for example, Polyimide (PI), Polyethersulfone (PES) Polyethylene terephthalate (PET) materials may also be used, and the material of the flexible substrate is not limited herein.
Since the flexible base material is relatively thin and flexible, the flexible base material is generally attached to the substrate, and then each film layer in the touch electrode layer is formed on the surface of the flexible base material. In the embodiment of the invention, the first protective layer is attached to the surface of the flexible base material and can play a role of supporting the flexible base material, so that the flexible base material can be smoothly attached to the substrate, excessive bubbles generated in the process of attaching the flexible base material to the substrate are prevented, the smoothness of a touch electrode layer formed on the flexible base material subsequently is prevented from being influenced, and the first protective layer is removed later, so that the structure of the flexible touch screen cannot be influenced.
Then, each film layer in the touch electrode layer is sequentially formed on the flexible base material, in order to prevent the flexible base material from curling when being separated from the substrate, a second protective layer is attached to the touch electrode layer, the second protective layer is similar to the first protective layer and can also play a supporting role, the curling is not easy to occur when the flexible base material is separated from the substrate, and then the second protective layer is removed, so that the structure of the flexible touch screen is not influenced.
Further, in the manufacturing method provided by the embodiment of the present invention, a difference between a thermal expansion coefficient of the first protection layer and a thermal expansion coefficient of the flexible substrate is less than 0.05%;
the difference between the thermal expansion coefficient of the second protective layer and the thermal expansion coefficient of the flexible base material is less than 0.05%.
Because the flexible substrate has a certain film shrinkage force, that is, when the temperature changes, the flexible substrate has a certain expansion and contraction, for example, the film shrinkage value of the flexible substrate made of COP material is 0.4 ± 0.05%, if the difference between the thermal expansion coefficients of the first protective layer and the flexible substrate is large, when the first protective layer is attached to the surface of the flexible substrate, the flexible substrate itself is not very flat, and thus the flexible substrate is attached to the substrate, bubbles are likely to occur, the flatness of the flexible substrate is affected, and the uneven surface of each film layer of the touch electrode layer formed subsequently is also caused. Similarly, if the difference between the thermal expansion coefficients of the second protective layer and the flexible substrate is large, the surface of the touch electrode layer is easily uneven when the second protective layer is attached to the touch electrode layer, and even the smoothness of the flexible substrate is affected. Therefore, the first protective layer and the second protective layer are made of materials similar to the thermal expansion coefficient of the flexible substrate to ensure the flatness of each film layer on the flexible substrate, in the embodiment of the present invention, the thermal expansion coefficients of the first protective layer and the second protective layer are preferably different from the thermal expansion coefficient of the flexible substrate by less than 0.05%.
Specifically, in the above manufacturing method provided by the embodiment of the present invention, the material of the first protection layer may be phenolic resin (PF), Polyethylene terephthalate (PET), or Cyclic Olefin Polymer (COP);
the material of the second protective layer is phenolic resin (PF), polyethylene terephthalate (PET) or cycloolefin polymer (COP).
In specific implementation, the first protection layer and the second protection layer are preferably made of the same material, and in addition, different materials may also be used, which are not limited herein, PF, PET or COP are only preferred materials provided by the embodiments of the present invention, and in specific implementation, the first protection layer and the second protection layer may also be made of other flexible materials, which are not limited herein.
In practical applications, COP materials are generally used for the flexible substrate, and in order to match the thermal expansion coefficient of the flexible substrate, the first protective layer and the second protective layer may be made of the same materials as the flexible substrate, so that the stretching force of the first protective layer (or the second protective layer) is consistent with that of the flexible substrate. In addition, in order to reduce the cost, a PET material or a PF material with a relatively low price may be used, which is not limited herein.
In a specific implementation, in the manufacturing method provided in an embodiment of the present invention, the step S102 may include:
referring to fig. 3d, a temperature controlled adhesive layer 203 is formed on the base substrate 103;
the flexible base material is attached to the substrate base plate through the temperature-controlled bonding layer.
Because the flexible base material is thin and the surface of the flexible base material is smooth, the flexible base material is directly attached to the substrate, bubbles are easily generated between the flexible base material and the substrate, and a temperature control bonding layer is formed on the substrate to improve the viscosity between the flexible base material and the substrate and avoid the generation of bubbles. In addition, the viscosity of the temperature-controlled adhesive layer is related to the temperature, for example, the viscosity of the temperature-controlled adhesive layer made of some materials gradually increases with the increase of the temperature, so that the flexible base material can be attached to the substrate base plate by utilizing the better relation between the temperature and the viscosity, and taking the example that the viscosity of the temperature-controlled adhesive layer is increased with the increase of the temperature as the temperature-controlled adhesive layer, the flexible base material can be flatly laid on the substrate base plate at a low temperature, and then the substrate base plate is heated to increase the viscosity of the temperature-controlled adhesive layer, so that the flexible base material and the substrate base plate are adhered together. Because the viscosity of the temperature-controlled bonding layer can be controlled through temperature, the flexible base material can be paved on the substrate base plate for enough time before the flexible base material is bonded with the substrate base plate, so that the smoothness of the flexible base material is better.
In an embodiment of the present invention, the temperature Adhesive layer may be an Optical Clear Adhesive (OCA) material, and a viscosity of the OCA material increases with an increase in temperature.
In practical applications, in the manufacturing method provided in the embodiment of the present invention, the step S107 may include:
and cutting the flexible substrate on which the touch electrode layer is formed, and then removing the second protective layer.
Because the flexible substrate after the touch electrode layer is formed is still very thin, if the flexible substrate is cut after the second protective layer is removed, the flexible substrate is easily curled by stress generated in the cutting process, or the structure of the touch electrode layer on the surface is easily scratched, so that the second protective layer needs to be removed after the flexible touch screen is cut into a plurality of single flexible touch screens. In addition, some module processes, such as bonding signal lines, may be performed before removing the second protective layer, which may serve as a growth film for the bonding process.
Specifically, in the manufacturing method provided by the embodiment of the present invention, before the step S101, the manufacturing method may further include:
as shown in fig. 3a, a hardened layer 201 is formed on each of both surfaces of the flexible substrate 101.
Because the flexible base material is brittle, the two surfaces of the flexible base material are respectively provided with the hardened layers, so that the flexibility of the flexible base material can be improved, and the flexible base material is not easy to break. Because the surface of flexible substrate is more smooth, directly attach flexible substrate on the substrate base plate, because the easy slip that takes place between flexible substrate and the substrate base plate, and produce the bubble easily in the attaching process, the sclerosis layer can also be regarded as the isolation layer, increases the viscidity between flexible substrate and the substrate base plate, prevents to take place to slide between flexible substrate and the substrate base plate.
More specifically, in the manufacturing method provided by the embodiment of the present invention, the step S101 may include:
as shown in fig. 3b, a vanishing layer 202 is formed on the surface of either side of the flexible substrate 101;
as shown in fig. 3c, a first passivation layer 102 is attached on the shadow-removing layer 202.
Because the transmissivity of the area with the graph of the touch electrode and the transmissivity of the area without the touch electrode in the touch electrode layer have certain difference, the surface of the flexible substrate is provided with the vanishing layer which plays a role in vanishing, so that human eyes can not distinguish the transmissivity difference, and the display effect can be improved.
In the manufacturing process, the flexible substrate, the hardened layers on the surfaces of the two sides of the flexible substrate, and the effect layer may be subjected to a subsequent process as a whole, as shown in fig. 3c, and in order to illustrate the flexible substrate, the hardened layers, and the shadow eliminating layer as a whole, the flexible substrate 101, the hardened layers 201, and the shadow eliminating layer 202 are enclosed by black bold line boxes. In a specific implementation, a flexible substrate having a hardening layer and a vanishing layer, which are fabricated in advance, may be bonded to the first protective layer to obtain the structure shown in fig. 3 c. Then, the structure shown in fig. 3c is attached to the structure shown in fig. 3d, wherein the surface of the substrate 103 shown in fig. 3d is provided with a temperature adhesive layer, and the surface of the flexible base material 101 shown in fig. 3c is provided with a hardened layer 201 to ensure that the flexible base material 101 can be smoothly attached to the surface of the substrate 101 to obtain the structure shown in fig. 3e, and then the first protective layer is removed to obtain the structure shown in fig. 3f to prevent the first protective layer from affecting the structure of the flexible touch screen.
Specifically, in the manufacturing method provided in the embodiment of the present invention, the step S104 may specifically include:
referring to fig. 3g, a plurality of first touch electrodes and a plurality of second touch electrodes are formed on a side of the flexible base material 101 away from the substrate 103; the plurality of first touch electrodes and the plurality of second touch electrodes may be formed by the same material and the same process, as shown in the first transparent conductive layer 204; specifically, a first touch electrode and a second touch electrode are mutually crossed, the first touch electrode is of a strip structure, and the second touch electrode comprises a plurality of sub-electrodes;
forming a plurality of signal lines; the signal line is connected with the first touch electrode or the second touch electrode; the signal lines are generally located in the frame region, and thus the signal lines may be made of metal material, as shown in fig. 3h, the metal layer 205 located on the first transparent conductive layer 204 represents a film layer where a plurality of signal lines are located;
as shown in fig. 3i, an insulating layer 206 is formed on the film layer (i.e. the metal layer 205) where the signal line is located;
as shown in fig. 3j, a plurality of bridge lines are formed over the insulating layer 206; the plurality of bridge connectors are positioned on the film layer where the second transparent conductive layer 207 is positioned; the bridging lines are used for connecting the sub-electrodes in the second touch electrode, so that the second touch electrode and the first touch electrode form mutual capacitance to detect touch. That is to say, the touch electrode layer includes a first transparent conductive layer, a metal layer, an insulating layer and a second transparent conductive layer.
The embodiment of the present invention describes the manufacturing process of the touch electrode layer by taking a mutual capacitance structure as an example, and in a specific implementation, the touch electrode layer may also adopt other structures, for example, a self-capacitance manner or a mutual capacitance manner with other structures, and the structure and the manufacturing process of the touch electrode layer are not limited herein.
As shown in fig. 3k, a second passivation layer 105 is attached on the second transparent conductive layer 207, so that the flexible touch screen can be smoothly separated from the substrate to obtain the structure shown in fig. 3l, and finally, after the structure shown in fig. 3l is divided to obtain a plurality of single flexible touch screens, the second passivation layer is removed to obtain the structure shown in fig. 3 m.
In a second aspect, based on the same inventive concept, an embodiment of the present invention provides a flexible touch screen, where the flexible touch screen is manufactured by the above method for manufacturing a flexible touch screen. Because the principle of solving the problems of the flexible touch screen is similar to that of the manufacturing method, the implementation of the flexible touch screen can refer to the implementation of the manufacturing method, and repeated parts are not described again.
In a third aspect, based on the same inventive concept, an embodiment of the present invention provides a display device, including the flexible touch screen, where the display device may be applied to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Because the principle of the display device for solving the problems is similar to that of the flexible touch screen, the implementation of the display device can be referred to that of the flexible touch screen, and repeated parts are not described again.
According to the flexible touch screen, the manufacturing method thereof and the display device provided by the embodiment of the invention, the first protective layer is attached to the surface of the flexible base material before the flexible base material is attached to the substrate, the first protective layer plays a supporting role, so that the flexible base material can be smoothly attached to the substrate, and the first protective layer is removed after the flexible base material is attached to the substrate, so that the structure of the flexible touch screen cannot be influenced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A method for manufacturing a flexible touch screen is characterized by comprising the following steps:
attaching a first protective layer on the surface of the flexible substrate;
attaching the surface of one side of the flexible base material, which is far away from the first protective layer, to a substrate; the substrate base plate is a hard base plate;
removing the first protective layer;
forming a touch electrode layer on one side of the flexible base material, which is far away from the substrate base plate, by adopting a roll-to-roll coating process, wherein the sheet resistance of the obtained touch electrode layer is within the range of 30-40 omega/□;
attaching a second protective layer to the surface of the touch electrode layer;
then, separating the flexible base material from the substrate base plate;
removing the second protective layer;
wherein the difference between the thermal expansion coefficient of the first protective layer and the thermal expansion coefficient of the flexible substrate is less than 0.05%;
the difference between the thermal expansion coefficient of the second protective layer and the thermal expansion coefficient of the flexible base material is less than 0.05%.
2. The manufacturing method according to claim 1, wherein the material of the first protective layer is a phenolic resin, polyethylene terephthalate, or a cyclic olefin polymer;
the second protective layer is made of phenolic resin, polyethylene terephthalate or cyclic olefin polymer.
3. The method of claim 1, wherein the attaching the surface of the flexible substrate facing away from the first protective layer to a substrate comprises:
forming a temperature-controlled bonding layer on the substrate base plate;
and the flexible base material is attached to the substrate base plate through the temperature control bonding layer.
4. The method of claim 1, wherein the removing the second protective layer comprises:
and cutting the flexible substrate forming the touch electrode layer, and removing the second protective layer.
5. The method according to any one of claims 1 to 4, wherein before the step of applying the first protective layer to the surface of the flexible substrate, the method further comprises:
and respectively forming a hardened layer on two surfaces of the flexible substrate.
6. The method of claim 5, wherein attaching a first protective layer to a surface of the flexible substrate comprises:
forming a layer of vanishing layer on the surface of any one side of the flexible base material;
and attaching the first protective layer on the shadow eliminating layer.
7. The manufacturing method of any one of claims 1 to 4, wherein the forming of the touch electrode layer on the side of the flexible substrate away from the substrate base plate comprises:
forming a plurality of first touch electrodes and a plurality of second touch electrodes on one side of the flexible base material, which is far away from the substrate base plate; the first touch electrode and the second touch electrode are mutually crossed, the first touch electrode is of a strip structure, and the second touch electrode comprises a plurality of sub-electrodes;
forming a plurality of signal lines; the signal line is connected with the first touch electrode or the second touch electrode;
forming an insulating layer on the film layer on which the signal line is positioned;
forming a plurality of bridge lines over the insulating layer; the bridging lines are used for connecting the sub-electrodes in the second touch electrode.
8. A flexible touch screen, characterized in that the flexible touch screen is manufactured by the manufacturing method of the flexible touch screen according to any one of claims 1 to 7.
9. A display device, comprising: the flexible touch screen of claim 8.
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| CN201810803180.5A CN109002236B (en) | 2018-07-20 | 2018-07-20 | Flexible touch screen, manufacturing method thereof and display device |
| US16/390,216 US11144142B2 (en) | 2018-07-20 | 2019-04-22 | Flexible touch screen, manufacturing method thereof and display device |
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| CN201810803180.5A CN109002236B (en) | 2018-07-20 | 2018-07-20 | Flexible touch screen, manufacturing method thereof and display device |
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| CN109002236B true CN109002236B (en) | 2022-08-23 |
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| CN111596779A (en) * | 2019-02-20 | 2020-08-28 | 上海和辉光电有限公司 | Flexible display device and method of manufacturing the same |
| CN110231891A (en) * | 2019-07-24 | 2019-09-13 | 蓝思科技（长沙）有限公司 | A kind of flexible cover plate and preparation method thereof, flexible OLED display |
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| CN109002236A (en) | 2018-12-14 |
| US20200026381A1 (en) | 2020-01-23 |
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